diff --git a/cassava-conduit.cabal b/cassava-conduit.cabal
--- a/cassava-conduit.cabal
+++ b/cassava-conduit.cabal
@@ -1,5 +1,5 @@
 name:               cassava-conduit
-version:            0.3.0
+version:            0.3.1
 license:            BSD3
 license-file:       etc/LICENCE.md
 author:             Dom De Re
@@ -32,7 +32,7 @@
     build-depends:      base < 5 && >= 4
                     ,   containers
                     ,   array
-                    ,   bifunctors              == 5.*
+                    ,   bifunctors              >= 4.2           && < 6
                     ,   bytestring              == 0.10.*
                     ,   cassava                 == 0.4.*
                     ,   conduit                 == 1.2.*